Disk grinding wheel



June 24,1930. T. v. THOMPSON 1,767,821

DISK GRINDING WHEEL Filed April '7, 1928 lhnn Y /7 a 18 17 i 16 9 712 76 I v Patented June 24, 1930 THOMAS V. THOMPSON or BELOIT, WISCONSIN DISK GRINDING WHEEL Application filed April 7,

This invention relates to diskgrinding wheels which have an abrasive disk or ring attached to the face of a disk wheel. The abrasive disk may be of any suitable abrasive material, either natural or artificial, de-

pending on the particular work to be ground. It is customary to mold or press the abrasive material to disk form while plastic and to cement a paper or cloth back 10... thereto. This cloth backed disk is then glued or cemented to the face of a steel wheel which in turn is adapted to be mounted on a spindle of a grinding machine for rotation at a comparatively high spee commensurate with the work to be performed. When the abrasive disk is worn down it is necessary to remove the remainder of the disk and substitute a new disk. The process of cleaning the face of the steel wheel and cementing a new disk thereto is well known in this art and it will sufiice to say that these operations require careful attention and considerable time. Where disk grinders are used continuously, especially in heavy I duty work, the-abrasive disks wear down rapidly and must be frequently replaced because of the-limited thickness of the disks, This is due to the fact its of thickness depend largely on the safety factor of the cement union between the abrasive disk and the wheel.

he primary purpose of the present invention is to improve the art of disk grinding by enabling .the use of abrasive disks or rings of considerably greater thickness than is permitted by present day practice. By increasing the thickness of the abrasive disk the grinding capacity is obviously increased. Furthermore, by reason of the increased grinding capacity the disks may be used for longer periods and fewerchangesare required, thus savingtime and reducing the cost of grinding operations per unit.

In furtherance of the foregoing I glue, or otherwise attach to the face of a disk wheel an abrasive disk or ring of greater than ordinary thickness and provide means for peripherally clamping the disk to the wheel. This peripheral clamping means not only further secures the disk to the wheel that the present lim- 1928. Serial No. 268,158.

but it also supports and reenforces the disk so as to permit of the greater thickness and the consequent overhang. lVhc-n the projecting portion of the disk is worn down substantially to the clamping means the latter will be removed or' withdrawn from its normal position so as to expose the entire disk and permit full use of the disk down to the wheel. My invention contemplates, therefore, the progressive use of a relativelv thick disk down to the wheel leaving no waste material other than usual I with the present practice of cemented disks.

I have also aimed to provide a simple and well balanced construction having minimum 6 diameter and weight. My invention further contemplates a construction characterized by such few parts as to. not only permit of economical manufacture but to facilitate the change or adjustment after the projecting part of the disk has been worn down.

Other objects and attendant advantages will be appreciated by those skilled in this art as the invention becomes better understood by reference to the following description when considered in connection with the accompanying drawing, in whicl Figure 1 is a face view of a disk Wheel embodying my invention;

Fig. 2 is a section taken on the line 22 30 of Fig. 1;

Fig. 3 is an enlarged section of the rim on line 22 of Fig. 1; and

- Fig. 4: is a detail section through the removable rim.

The disk wheel 4, usually of steel, may be suitably constructed for mounting on a spindle 5. In this case the wheel is equipped with a collar 6 adapted to be threaded onto the spindle, as shown.

The abrasive disk 7 has the usual cloth back 8 cemented thereto and is in turn cemented to the face of the wheel in the usual manner. It should be here noted that my invention contemplates the use of any abra- 95 sive disk secured to the wheel in any suitable manner. It also contemplates the use of an abrasive disk or ring of any material and any suitable shape or form. One of the principal advantages afforded, however, is the 1 grinding purpose of illustration.

In order to peripherally clamp the abrasive disk my invention contemplates in the preferred embodiment the use of a clamping ring or a segment ring structure so mounted on the disk Wheel-that it may be removed or displaced from its normal clamping position after the projecting portion of the disk has i In the" present embodiment of my invention I employ a sectional ring structure comprising two ring sections or members 9 and 11 which as shown in Fig. 1 substantially circumscribes the abrasive disk. These ring members are located in an annular internal groove 12 in a rim 13 which seats on the periphery and back of the disk wheel as clearly shown in Fig. 2, and is removably secured thereto by screws 14. The groove 12 is so located that the ring members will be positioned over the periphery of the abrasive disk contiguous to the face of the wheel. Each ring member has an inner face 15 adapted to fit against the periphery of the abrasive disk and an outer tapered face 16 adapted to be engaged by suitable means in a wedging 'action for forcing the ring member inwardly and clamping it against the abrasive disk. The front and back walls 17 and 18 of the groove 12 are perpendicular to the axis of rotation of the disk wheel and the been worn down.

.ring members have a sliding fit between these flat walls. The means here shown for clamping the ring members against the abrasive disk is exceptionally simple and practical for the purpose, and comprises screws 19 threaded into the rim 13 from the back and provided with tapered or frusto-conical ends 21 the angle of which is complemental .to that of the taper 16. The screws 19 are spaced circumferentially about the rim so as to engage the ring members at sufficient points to exert the desired clamping pressure. This construction is exceptionally rigid and permits of clamping the abrasive disk with ample pressure. Each screw is slotted or otherwise formed at its rear end for insertion of a suitable tool and when tightened it will serve as a lock to secure the ring member in the clamping position. The

. ring members when loosened are held from shifting by locating'studs 22 interposed between the split ends of said members. It will be manifest that when the screws 14 and 19 are sufficiently loosened without, however, removal from the rim, the latter may be removed in its entirety from the disk wheel carrying with it the ring members 9 and 11.

In practice the abrasive disk or ring will be secured to the face of the disk wheel in necessary to remove any suitable or preferred manner as, for example, by cementing as illustrated herein.

The clamping means will then be applied by slipping the rim over the disk wheel from the rear, then securing it in position thereon by means of the screws 14 and then clamping the ring members by means of the screws 19. The grinding wheel in this condition may be used in the manner of any disk wheel of this type until the projecting portion of the abrasive disk is worn down substantially to the face of the clamping rim. The clamping rim will then be removed, thus permitting use of the remainder of the abrasive disk substantially to the face of the disk wheel.

It will be manifest to those skilled in this art that my invention provides for the use, of an abrasive disk of considerably greater thickness and capacity than was heretofore permitted with the type of disk that was cemented to the disk wheel, also that there are many practical advantages some of which are recited above. It should be further noted that my invention distinguishes from the so-called chuck type of disk wheel in which the abrasive disk is not attached as by cementing to the wheel but is merely clamped on its periphery. In this type it is the abrasive disk from the wheel at each setting and toinsert packing plugs between the disk and wheel. Furthermore, the abrasive disk or ring can not be used to its full capacity since. there always I remains in the chuck a disk having a thickness of about 1 inch. My invention also distinguishes from that type known as a metal back abrasive wheel in which the wheel has slots or grooves for reception of the abrasive material, but it is necessary to return this type of wheel to the manufacturer after it has been worn down. It is possible, however, to employ in connection with my invention this latter method of attaching the abrasive disk to the wheel. While this would provide for greater grinding capacity it would not, however, be so desirable in respect to the method of attaching the abrasive disk to the wheel.

From the foregoing it will be seen that my.

disks of greater wheel, an abrasive disk or ring cemented or otherwise attached to the face of the wheel, a ring for peripherally clamping the disk, a wheel rim for holding the ring 1n position, and screws threaded in the wheel rim having tapered faces acting against the ring for applying the clamping pressure.

3. abrasive tool comprising a disk Wheel, and abrasive disk or ring secured to the face of the wheel, a rin structure for peripherally clamping the a rasive disk, a Wheel rim having an annular internal groove in which the ring structure is located, the ring structure having a beveled periphery, screws threaded in the wheel rim having beveled ends engagin the beveled eriphery of the ring structure or applying t e c amping pressure, and means connecting the rim to the wheel permitting withdrawal of the clamping ring structure from the abrasive wheel.

4. An abrasive. tool comprising a disk wheel, an abrasive disk adapted to be cemented on the face of the wheel, a rim shaped to seat on the back and periphery of the Wheel and having a portion overreaching the abrasive disk,-said overreaching portion having an annular internal groove, disk clamping means located in said groove screws. threaded in the rim and connected with the clamping means for exerting the clamping pressure, and means connecting the eel.

5. An abrasive tool as set forth in claim 9, in which the rim is bodily movable upon and with respect to the wheel for withdrawing the clamping means from the abrasive dis to permit the use of theremaining portion of the disk,

6. 'An abrasive tool comprising a disk wheel, an abrasive disk adapted to be positioned on the face of the wheel, a rim shaped to seat on the back and periphery of the wheel and having a portion overreaching the abrasive disk, said portion having an annular internal groove, a sectional clamping ring disposed in said groove tapered on its periphery, screws threaded in the rim from the back thereof having tapered forward ends complemental to and acting against the tapered periphery of the clamping ring for exerting the clamping 'the wheel to with pressure, and means fastening the rim to the wheel, the rim bein movable rearwardly on draw the clamping ring from the abrasive disk.

In witness of the foregoing I aflix my signature.

THOMAS V. THOMPSON.

CERTIFICATE or CORRECTION.

Patent No. 1,767,821. I Granted June 24, 1930, to

THOMAS V. THOMPSON.

It is hereby certified that error appears in the printed specifieat-m. n.' the above numbered patent requiring correction as follows: Page 3, line 47; claim 5, for "claim 9" read "claim 4"; and that the said Letters Patent should be read with this correction therein that the same may conform tothe record of the case in the Patent Office. 1

Signed and sealed this 22nd day of July, A. D. 1930.

'Wm. A. Kinnan, (Seal) Acting Commissioner of Patents. 

